Transcription of Section 4: PRESTRESSING STRANDS/BARS - Caltrans
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Section 4: PRESTRESSING STRANDS/BARS - Caltrans
Section 4 FEBRUARY 2014. Section 4: PRESTRESSING STRANDS/BARS . The base material used to fabricate PRESTRESSING steel must conform to the requirements of ASTM. A416 or A722, and the Standard The A416 designation covers the requirements for both ( mm) and ( mm) strands. The A722 designation gives requirements for high-strength steel bars. Figures 4-2, 4-3, and 4-4 show typical stress-strain curves and physical properties for ( mm), ( mm) strand, and grade 150 ksi (1030 MPa). bars. Figure 4-1 Low-Lax Strand Manufacturing Process. 18. 2010 SS, Section , PRESTRESSING steel . Caltrans PRESTRESS MANUAL 4- 1. Section 4 FEBRUARY 2014. All strands are the seven-wire type with a center wire enclosed by six helically placed outer wires. The center wire is slightly larger than the outer six wires. Strand is stress relieved by continuous heat treatment, a process that produces a slight bluish tint to the strands. The process of fabricating low-lax strand is schematically shown in Figure 4-1.
allow the use of couplers for extending plain or deformed bars. The coupled unit must have a tensile strength of not less than the manufacturer’s minimum guaranteed ultimate tensile strength of the bars. Figure 4-2 – Typical Stress-Strain Curve for 0.5 inch (12.70 mm) 270 ksi (1860 MPa) Strand 2010 SS, Section 50-1.02B, Prestressing Steel. C
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